<div id="login">
    <form method="post" action="<?php PrintURL("system", "login"); ?>">
        <label for="username">Username: </label><input type="text" name="username" /><br/>
        <label for="password">Password: </label><input type="password" name="password" /><br/>
        <input type="submit" value="Login"/>
    </form>
</div>